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Vostok 3 launches from the Baikonur Cosmodrome and cosmonaut Andrian Nikolayev becomes the first person to float in microgravity.
Upon the expiration of the Brioni Agreement, Croatia and Slovenia sever all official relations with Yugoslavia.
The royalist Leonardopoulos–Gargalidis coup d'état attempt fails in Greece, discrediting the monarchy and paving the way for the establishment of the Second Hellenic Republic.
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